Blender running at a crawl after NVidia update
It looks like the problem has been solved for at least myself and some other people. I and at least one other person sent a bug ticket to NVidia. NVidia stated the auto update I received was a generic Windows update and not one from NVidia. They recommended getting the appropriate driver form this URL: http://www.nvidia.com/Download/Find.aspx?lang=en-us and follow the NVidia instruction for installing it. I did the Advanced install and clicked the button to erase all of the old drivers to prevent any conflicts. It worked great and I think my Blender is running faster. I also downloaded the HP driver for this card as NVidia recommends, but it was more than 2 years old. I’ll just keep it for a backup.
I hope this solves the problem for others.